A homopolar motor is a simple electric motor that operates using the principles of electromagnetism. Unlike traditional electric motors, which use magnets and electromagnets to create rotational motion, a homopolar motor utilizes a single magnetic field and a conducting wire to generate movement. Here’s a basic experiment to create a homopolar motor:

Materials Needed:

  1. AA or AAA battery
  2. Neodymium magnet (small, cylindrical)
  3. Copper wire (thin gauge, insulated)
  4. Scissors or wire cutters
  5. Tape (electrical tape or adhesive tape)


  1. Prepare the Wire:
    • Cut a length of copper wire, approximately 6-8 inches long.
    • Remove the insulation from both ends of the wire, exposing the bare copper.
  2. Assemble the Setup:
    • Place the neodymium magnet flat on a table or any flat surface.
    • Place the battery on top of the magnet with the positive (+) terminal facing upward.
    • Tape one end of the wire to the positive terminal of the battery, ensuring a secure connection.
    • Position the other end of the wire so that it makes contact with the negative (-) terminal of the battery. The wire should touch the negative terminal but not be taped to it.
  3. Create the Circuit:
    • The setup should now have the battery, magnet, and wire in place. The wire should be in contact with both the positive terminal of the battery and the negative terminal.
    • Ensure that the wire is positioned such that it can rotate freely without touching the battery or magnet excessively.
  4. Observe the Motor Action:
    • Once the setup is complete, the homopolar motor should start to spin.
    • The spinning motion occurs due to the interaction between the magnetic field created by the current flowing through the wire and the magnetic field of the magnet.
    • The wire acts as a conductor, and when a current flows through it in the presence of a magnetic field, it experiences a force known as the Lorentz force, causing it to rotate.
  5. Experiment with Adjustments:
    • Try adjusting the position of the wire and the battery to optimize the motor’s performance.
    • You can also try using different wire lengths or types of magnets to observe how they affect the motor’s speed and direction of rotation.
  6. Safety Precautions:
    • Exercise caution when handling the neodymium magnet, as it is strong and can pinch fingers if mishandled.
    • Supervise the experiment, especially if conducting it with young children.

The homopolar motor experiment provides a simple yet fascinating demonstration of electromagnetism in action. It’s a great way to introduce basic principles of electricity and magnetism to learners of all ages.

No responses yet

Leave a Reply

Your email address will not be published. Required fields are marked *

x  Powerful Protection for WordPress, from Shield Security
This Site Is Protected By
Shield Security